US9460334B2 - Control method for fingerprint recognition apparatus - Google Patents

Control method for fingerprint recognition apparatus Download PDF

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US9460334B2
US9460334B2 US14/615,361 US201514615361A US9460334B2 US 9460334 B2 US9460334 B2 US 9460334B2 US 201514615361 A US201514615361 A US 201514615361A US 9460334 B2 US9460334 B2 US 9460334B2
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fingerprint
fingerprint recognition
recognition apparatus
processor
sensed image
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US20160034741A1 (en
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Kuo-Neng Lan
Yuan-Lin Chiang
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Egis Technology Inc
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Egis Technology Inc
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    • G06K9/00087—
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
    • G06F1/3234—Power saving characterised by the action undertaken
    • G06F1/325—Power saving in peripheral device
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
    • G06F1/3234—Power saving characterised by the action undertaken
    • G06F1/3287—Power saving characterised by the action undertaken by switching off individual functional units in the computer system
    • G06K9/00—
    • G06K9/0002—
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/1365—Matching; Classification
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate

Definitions

  • the present invention relates to fingerprint recognition, and, in particular, to an electronic device having a low-power fingerprint recognition apparatus and an associated control method.
  • an electronic device having a low-power fingerprint recognition apparatus and its control method are provided in the invention, thereby reducing the power consumption of the fingerprint recognition apparatus in the mobile device.
  • an electronic device comprises: a processor; a fingerprint recognition apparatus comprising a plurality of fingerprint sensing cells and a plurality of touch sensing cells; and a housing, wherein the processor is installed inside the housing.
  • the processor controls the fingerprint recognition apparatus to enter a power-down mode to turn off the fingerprint sensing cells and the touch sensing cells.
  • the processor receives a fingerprint recognition request signal from the application, the processor further controls the fingerprint recognition apparatus to enter a power-saving mode to capture a first sensed image.
  • the processor determines that the first sensed image is a fingerprint image
  • the processor further controls the fingerprint recognition apparatus to enter an operation mode.
  • a control method of a fingerprint recognition apparatus for use in an electronic device comprises a processor, a fingerprint recognition apparatus and a housing.
  • the fingerprint recognition apparatus comprises a plurality of fingerprint sensing cells and a plurality of touch sensing cells, and the processor is installed within the housing.
  • the method comprises the steps of: controlling the fingerprint recognition apparatus to enter a power-down mode to turn off the fingerprint sensing cells and the touch sensing cells when an application executed by the application does not utilize the fingerprint recognition apparatus; controlling the fingerprint recognition apparatus to enter a power-saving mode to capture a first sensed image when the processor receives a fingerprint recognition request signal from the application; and controlling the fingerprint recognition apparatus to enter an operation mode when it is determined that the first sensed image is a fingerprint image.
  • an electronic device comprises: a processor; a fingerprint recognition apparatus comprising a plurality of fingerprint sensing cells; and a housing.
  • the processor is installed inside the housing.
  • the processor controls the fingerprint recognition apparatus to enter a power-down mode to turn off the fingerprint sensing cells.
  • the processor receives a fingerprint recognition request signal from the application, the processor further controls the fingerprint recognition apparatus to enter a power-saving mode and activates a portion of the fingerprint sensing cells to capture a first sensed image.
  • the processor determines that the first sensed image is a fingerprint image, the processor further controls the fingerprint recognition apparatus to enter an operation mode.
  • a control method of a fingerprint recognition apparatus for use in an electronic device comprises a processor, a fingerprint recognition apparatus, and a housing.
  • the fingerprint recognition apparatus comprises a plurality of fingerprint sensing cells, and the processor is installed within the housing.
  • the method comprises the steps of: controlling the fingerprint recognition apparatus to enter a power-down mode to turn off the fingerprint sensing cells and the touch sensing cells when an application executed by the application does not utilize the fingerprint recognition apparatus; controlling the fingerprint recognition apparatus to enter a power-saving mode and activate a portion of the fingerprint sensing cells to capture a first sensed image when the processor receives a fingerprint recognition request signal from the application; and controlling the fingerprint recognition apparatus to enter an operation mode when it is determined that the first sensed image is a fingerprint image.
  • FIG. 1A is a block diagram of an electronic device in accordance with an embodiment of the invention.
  • FIG. 1B is a top-view diagram of the electronic device 100 in accordance with an embodiment of the invention.
  • FIG. 2A is a diagram of the fingerprint sensor array 151 in accordance with an embodiment of the invention.
  • FIG. 2B is a diagram of the fingerprint sensor array 151 in accordance with an embodiment of the invention.
  • FIG. 2C is a diagram of the fingerprint sensor array 151 in accordance with another embodiment of the invention.
  • FIG. 2D is a diagram of the fingerprint sensor array 151 in accordance with another embodiment of the invention.
  • FIG. 2E is a diagram of the fingerprint sensor array 151 in accordance with another embodiment of the invention.
  • FIG. 3 is a flow chart of the control method of a fingerprint recognition apparatus in accordance with an embodiment of the invention.
  • FIG. 1A is a block diagram of an electronic device in accordance with an embodiment of the invention.
  • the electronic device 100 comprises a processor 110 , a memory unit 120 , a storage unit 130 , a touch screen 140 , and a fingerprint recognition apparatus 150 .
  • the electronic device 100 may be a smartphone, or a tablet PC.
  • the processor 110 may be one or more central processing units (CPU), general-purpose processors, digital signal processors, or application-specific processors which execute one or more types of computer-readable mediums stored in the memory unit 120 .
  • the memory unit 120 and the storage unit 130 comprise one or more types of computer-readable mediums.
  • the memory unit 120 may be a high-speed random access memory such as SRAM or DRAM
  • the storage unit 130 may be a non-volatile memory such as a flash memory (e.g. embedded multi-media card (eMMC)).
  • the storage unit 130 stores the program code of an operating system 134 such as LINUX, UNIX, OS X, Android, iOS, Windows, or an embedded operating system.
  • the operating system 134 may execute a plurality of sequences of basic system services and hardware dependent tasks.
  • the storage unit 130 further comprises one or more applications 132 .
  • the applications stored in the storage unit 130 may comprise a communication application, telephone application, email application, text message or instant message application, note application, address book or contact list, calendar, media player, and payment application.
  • the communication application controls the communication sequence and authentication sequence of the electronic device 100 while receiving an incoming call.
  • fingerprint recognition functionality is utilized to determine whether the user of the electronic device is currently receiving the incoming call, wherein the above-identified fingerprint recognition is performed by the fingerprint recognition apparatus 150 and the details will be described later. It should be noted that the above-mentioned communication application is for description, and those skilled in the art will appreciate that fingerprint recognition can be used in different types of applications to increase security.
  • the storage unit 130 further comprises a fingerprint database 136 , wherein the fingerprint database 136 pre-stores a plurality of biometric points of at least one user fingerprint image, and the stored biometric points are further utilized by the processor 110 to perform fingerprint recognition to identify a user.
  • the touch screen 140 may detect contact and any movement or break thereof using any of a plurality of touch sensitivity technologies now known or to be later developed, including, but not limited to capacitive, resistive, infrared, and surface acoustic wave technologies, as well as other proximity sensor arrays or other elements for determining one or more points of contact with the touch screen 140 .
  • the touch screen 140 may also display images from applications 132 executed by the processor 110 .
  • the fingerprint recognition apparatus 150 comprises a fingerprint sensor array 151 having a plurality of fingerprint sensing cells for detecting a fingerprint image of a user.
  • the fingerprint sensing cells may be optical sensors, ultrasonic sensors, capacitive sensors, or thermal sensors, but the invention is not limited thereto.
  • the fingerprint recognition apparatus 150 is further configured to detect whether a touch event takes place on the fingerprint recognition apparatus 150 .
  • the processor 110 may analyze the fingerprint image detected by the fingerprint recognition apparatus 150 , calculate biometric points of the fingerprint image, and match the calculated biometric points with the biometric points of the user's fingerprint image pre-stored in the fingerprint database 136 of the storage unit 130 .
  • the processor 110 When the calculated biometric points matches the pre-stored biometric points of the user's fingerprint image, the processor 110 generates an authentication signal which is further utilized by other applications requiring the authentication signal in the applications 132 .
  • the fingerprint recognition apparatus 150 may optionally comprise a processor 152 , wherein the processor 152 may be a digital signal processor or a microcontroller, and the above-mentioned operations performed by the processor 110 can be executed by the processor 152 .
  • the electronic device 100 further comprises radio frequency (RF) circuitry 160 , which is coupled to one or more antennas 165 and may allow communication with one or more additional devices, computers and/or servers using a wireless network.
  • the portable electronic device 100 may support various communications protocols, such as code division multiple access (CDMA), Global System for Mobile Communications (GSM), Enhanced Data GSM Environment (EDGE), High-Speed Downlink Packet Access (HSDPA), Wi-Fi (such as IEEE 802.11a/b/g/n), Bluetooth, Wi-MAX, a protocol for email, instant messaging (IM), and/or a short message service (SMS), but the invention is not limited thereto.
  • CDMA code division multiple access
  • GSM Global System for Mobile Communications
  • EDGE Enhanced Data GSM Environment
  • HSDPA High-Speed Downlink Packet Access
  • Wi-Fi such as IEEE 802.11a/b/g/n
  • Bluetooth Wi-MAX
  • Wi-MAX a protocol for email, instant messaging (IM), and/or a short message service
  • FIG. 1B is a top-view diagram of the electronic device 100 in accordance with an embodiment of the invention.
  • the components of the electronic device 100 shown in FIG. 1A are deployed in a housing 170 .
  • the touch screen 140 is disposed on a first surface 180 of the housing
  • the fingerprint recognition apparatus 150 is disposed on the side surface of the housing 170 , such as any position of the side surface 182 between the first surface 180 and its opposite surface (i.e. the side surface is perpendicular to the first surface and its opposite surface).
  • FIG. 2A is a diagram of the fingerprint sensor array 151 in accordance with an embodiment of the invention.
  • the fingerprint sensor array 151 comprises a dielectric layer 154 , a plurality of fingerprint sensing cells 155 , and a plurality of touch detection cells 153 .
  • each fingerprint sensing cell 155 can be implemented by a capacitive electrode which may sense an electric field to generate a second sensed image, and the electric field sensed by each fingerprint sensing cell 155 can be defined as an effective sensing region.
  • Each touch sensing cell 153 can be also implemented by a capacitive electrode, and is configured to detect a touch event of an object (e.g.
  • the fingerprint sensing cells and the touch sensing cells 153 are arranged in an array, and each touch sensing cell 153 is interposed among four neighboring fingerprint sensing cells 155 . In another embodiment, each touch sensing cell 153 is interposed between every two neighboring fingerprint sensing cells 155 . In yet another embodiment, the array formed by the touch sensing cell 153 can be interposed within the array formed by the fingerprint sensing cells 155 , and the number of the touch sensing cells 153 is less than that of the fingerprint sensing cells 155 . That is, the resolution of the first sensed image generated by the touch sensing cells 153 is lower than that of the second sensed image generated by the fingerprint sensing cells 155 .
  • a higher resolution is required for the fingerprint sensing cells 155 to detect valleys and ridges of a fingerprint, and thus a greater operation voltage should be applied to the capacitive electrodes of the fingerprint sensing cells, resulting in higher power consumption.
  • the touch sensing cells 153 are configured to detect touch events, and the resolution of the first sensed image generated by the touch sensing cells 153 is lower than that of the second sensed image generated by the fingerprint sensing cells while detecting fingerprint images. Accordingly, a lower operation voltage can be applied to the capacitive electrodes of the touch sensing cells 153 .
  • the processor 110 may control the fingerprint recognition apparatus 150 to enter a power-saving mode and only activate the touch sensing cells 153 .
  • the processor 110 may control the fingerprint recognition apparatus 150 to enter an operating mode and activate the fingerprint sensing cells 155 .
  • FIG. 2B is a diagram of the fingerprint sensor array 151 in accordance with an embodiment of the invention.
  • the resolution of the sensing image detected by the fingerprint sensor array 151 may be up to 128 ⁇ 128 pixels, and the fingerprint sensor array 151 can be divided into a plurality of sensing blocks 157 , wherein the image resolution of each sensing block 157 may be up to 32 ⁇ 32 pixels.
  • the numeric values of the image resolution of the fingerprint sensor array 151 and each sensing block 157 are for description only. Those skilled in the art will appreciate that the resolution of the fingerprint sensor array 151 and each sensing block can be adjusted based on practical conditions.
  • the fingerprint recognition apparatus 150 may stay in a power-saving mode when the fingerprint recognition apparatus 150 is not being utilized by the applications. In the power-saving mode, the fingerprint recognition apparatus 150 may decrease the image resolution of the detected image in order to save power. For example, in an embodiment, the fingerprint recognition apparatus 150 may activate all or only a portion of the touch sensing cells 153 of the fingerprint sensor array 151 . For example, the fingerprint recognition apparatus 150 may activate only one of the sensing blocks 157 to detect the first sensed image having a resolution of 32 ⁇ 32 pixels. The processor 110 may determine that the object touching on the fingerprint recognition apparatus 150 is a human finger or other object according to the first sensed image.
  • the processor 110 When it is determined that a human's finger is touching on the fingerprint recognition apparatus 150 , the processor 110 will activate all or a portion of the fingerprint sensing cells 155 to capture the second sensed image, wherein the resolution of the second sensed image is higher than that of the first sensed image.
  • FIG. 2C is a diagram of the fingerprint sensor array 151 in accordance with another embodiment of the invention.
  • the touch sensing cells 153 can be disposed between two neighboring fingerprint sensing cells 155 of the fingerprint sensor array 151 .
  • a touch sensing cell 153 can be disposed between every two horizontally neighboring fingerprint sensing cells 155 .
  • FIG. 2B and FIG. 2C are only for description purpose, and the invention is not limited to the aforementioned arrangement.
  • the array of the fingerprint sensing cells 155 and the array of the touch sensing cells 153 can be arranged in different ways and may have different number of sensing cells.
  • the processor 110 determines whether a human finger or another object is touching on the fingerprint recognition apparatus 150 according to the first sensed image. When it is determined that a human's finger is touching on the fingerprint recognition apparatus 150 (i.e. the first sensed image is a fingerprint image), the processor 110 will activate all or a portion of the fingerprint sensing cells to capture the second sensed image, wherein the resolution of the second sensed image is higher than that of the first sensed image.
  • the fingerprint recognition apparatus 150 when the fingerprint recognition apparatus 150 is not being used by the applications (e.g. the processor 110 has not received a fingerprint recognition request signal), the fingerprint recognition apparatus stays in a power-down mode.
  • the processor 110 receives a fingerprint recognition request signal (e.g. the communication application receives an incoming call and generates the fingerprint recognition request signal)
  • the processor 110 determines that the incoming call can be accepted or picked up only when the fingerprint authentication is approved.
  • the processor 110 controls the fingerprint recognition apparatus to enter a power-saving mode, such as using the methods described in the embodiments in FIG. 2B or FIG. 2C to activate all or a portion of the touch sensing cell 153 to capture the first sensed image.
  • the processor 110 When the processor determines that the first sensed image is a fingerprint image, the processor 110 activates all or a portion of the fingerprint sensing cells 155 , so that the fingerprint recognition apparatus 150 enters an operation mode to capture the second sensed image with a higher resolution in order to perform fingerprint recognition.
  • the processor 110 further calculates the biometric points of the second sensed image, and matches the calculated biometric points with the biometric points of the user's fingerprint image pre-stored in the fingerprint database 136 . When the biometric points match, the processor 110 will transmit a fingerprint authentication approval signal to the corresponding application.
  • FIG. 2D is a diagram of the fingerprint sensor array 151 in accordance with another embodiment of the invention.
  • the fingerprint sensor array 151 comprises a dielectric layer 154 , and a plurality of fingerprint sensing cells 155 .
  • the fingerprint recognition apparatus 150 does not comprise the touch sensing cells 153 as shown in FIG. 2A . That is, the fingerprint recognition apparatus 150 only comprises the fingerprint sensing cells 155 . In the power-saving mode, the fingerprint recognition apparatus 150 only activates a portion of the fingerprint sensing cells 155 in the fingerprint sensor array 151 to capture a first sensed image.
  • the processor 110 determines whether the object touching on the fingerprint recognition apparatus 150 is a human's finger or other object.
  • the processor 110 When it is determined that a human's finger is touching on the fingerprint recognition apparatus 150 , the processor 110 will activate all or a portion of the fingerprint sensing cells 155 to capture a second sensed image, wherein the resolution of the second sensed image is higher than that of the first sensed image.
  • the first way for activating a portion of the fingerprint sensing cells 155 indicates that the activated fingerprint sensing cells 155 are interleaved, and there are one or more inactivated fingerprint sensing cells 155 between two neighboring activated fingerprint sensing cells 155 .
  • the processor 110 may activate one of every four fingerprint sensing cells 155 to capture a first sensed image.
  • the processor 110 may activate one of every two fingerprint sensing cells 155 , or activate all of the fingerprint sensing cells 155 , to capture a second sensed image having a higher resolution.
  • FIG. 2E is a diagram of the fingerprint sensor array 151 in accordance with another embodiment of the invention.
  • the second way is to divide the fingerprint sensing cells 155 of the fingerprint sensor array 151 into a plurality of sensing blocks such as the sensing blocks 157 a - 157 f as shown in FIG. 3E .
  • a portion of sensing blocks 157 e.g. one or more sensing blocks 157 are activated in the power-saving mode to capture a first sensed image.
  • the processor 110 determines that a human's finger is touching on the fingerprint recognition apparatus 150 according to the first sensed image, the processor 110 activates all or a portion of the sensing blocks 157 to capture a second sensed image, wherein the resolution of the second sensed image is higher than that of the first sensed image. For example, when the fingerprint recognition apparatus 150 is in the power-saving mode, the processor 110 may activate the sensing blocks 157 a , 157 d , and 157 e to capture a first sensed image. When the processor 110 determines that a human's finger is touching on the fingerprint recognition apparatus 150 (e.g. determining that the first sensed image is a fingerprint image), the processor 110 may activate all of the sensing blocks 157 a - 157 f to capture a second sensed image having a higher resolution.
  • FIG. 3 is a flow chart of the control method of a fingerprint recognition apparatus in accordance with an embodiment of the invention.
  • the fingerprint recognition apparatus 150 e.g. disposed on the side surface of the electronic device 100 .
  • the processor 110 receives a fingerprint recognition request signal from the application, the processor 110 controls the fingerprint recognition apparatus 150 to enter a power-saving mode and activates the touch sensing cells 153 to capture a first sensed image.
  • step S 330 when the processor 110 (or processor 152 ) determines that the captured first sensed image is a fingerprint image, the processor 110 controls the fingerprint recognition apparatus 150 to enter an operation mode. In the operation mode, the processor 110 activates all or a portion of the fingerprint sensing cells 155 in the fingerprint recognition apparatus 150 to capture a second sensed image, wherein the resolution of the second sensed image is higher than that of the first sensed image.

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  • Engineering & Computer Science (AREA)
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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
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  • Computer Hardware Design (AREA)
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TW103126347A TWI557649B (zh) 2014-08-01 2014-08-01 電子裝置及指紋辨識裝置控制方法

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